cutting coil springs - Impala Tech
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post #1 of 6 (permalink) Old 07-22-2009, 01:11 AM Thread Starter
 
 
Join Date: Aug 2008
Location: BC Canada
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cutting coil springs

last yr i replaced the rear coils in my impala with a couple stock Moog heavy duty coils, so i've been driving on them for a yr, i just cut one coil off and got a two inch drop. cool.
i just got two new Moog front coils and cut one coil off and the car sits exactly the same height as before, so, i'm assuming the originals had sagged a bit.

so first, do you think these new springs will 'wear in' and drop a bit?

and two, what would happen if i just cut one more coil? i'd like to get the front down about 2" as well.....

thanks in advance... mo

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post #2 of 6 (permalink) Old 07-22-2009, 01:45 AM
 
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Cutting coils can lead to a VERY bad ride and poor suspension performance. Some springs you can get by with it (mainly single rate springs if you just cut a little off), also some springs have a "dead" coil which when cut off won't affect ride quality, alot of mustang guys trim the Ford Racing springs as they have this dead coil. I did that on my Mustang and trimmed a set of stock 4cyl springs for the front and it rode nice but would bottom out easier on a huge bump. Also if you didn't index the spring correctly when reinstalling it this could be a problem, drive around for a bit and see how it goes.
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post #3 of 6 (permalink) Old 07-22-2009, 08:56 AM
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It takes about two weeks of driving for a new spring to take a set. The better solution to lowering a car two inches is with a change of front spindles. By moving the spindle up two inches on the steering knuckle you drop the car two inches and it will not affect the cars steering geometry or ride. By cutting the coil you increase the spring rate (since fewer coils are carrying the load it gets stiffer) and reduce your suspension travel (spend more time hitting the bump stops)

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post #4 of 6 (permalink) Old 07-22-2009, 05:18 PM
BA.
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Using drop spindles is certainly an easy way to go to keep the same ride.

I had read much about how it changed the geometry under cornering though. Whadda ya think Dave?

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post #5 of 6 (permalink) Old 07-23-2009, 06:13 PM Thread Starter
 
 
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i know it's not the best solution, however i wanted something quick and cheap, that being said, the ride has firmed up without being harsh, and once i get it to sit right i'll get the front end aligned.

so for now i'll put some miles on this week to see if it settles lower and if not i'll prolly take a 1/2 coil out on the weekend.

thanks guys... mo
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post #6 of 6 (permalink) Old 07-23-2009, 09:18 PM
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Quote:
Originally Posted by BA. View Post
Using drop spindles is certainly an easy way to go to keep the same ride.

I had read much about how it changed the geometry under cornering though. Whadda ya think Dave?
A dropped spindle doesn't affect steering geometry at all as the same steering knuckle is still used and the suspension follows all of the same arcs it did before without any change in suspension travel or spring rate. It can cause a deeply offset rim to hit the bottom A-arm if you are running steam roller sized wheels in 15 inch; but that problem quickly goes away as you increase the wheel diameter. For the same reason disc brake calipers might need to be clocked (rotated down below the wheel centerline) as the raised spindle will bring the caliper into contact with the upper A-arm or shock if mounted to the A-arm. The disc brake vendors put foot notes in the sales literature warning of any conflicts with dropped spindles.

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